Drawing-board



(No Model.) 2 Sheets-sheet 1.

J. O. POOLE.

DRAWING BOARD. No. 564,840. Patented Ju1y-28, 1896-.

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(No Model.) 2 Sheets-Sheet 2. J. O. POOLE.

' DRAWING BOARD. Ila-564,840. Patented July 28:, 1896-.

UNITED STATES PATENT OFFICE.

JACOB O. POOLE, OF NEWARK, NEWV JERSEY, ASSIGNOR OF ONE-HALF TO EDMUNDP. BACKUS, OF EAST ORANGE, NEW JERSEY.

DRAWING -BOARD.

SPECIFICATION forming part of Letters Patent No. 564,840, dated July 28,1896.

Application filed October 30,1895- Serial No. 567,402. (No model.)

To all whom it may concern: parts, such as Will be more fully broughtout Be it known that I, JACOB O. POOLE, a citiin the accompanyingspecification, and finally zen of the United States, residing at Newark,embodied in the clauses of the claim.

in the county of Essex and State of New J er- The invention isillustrated in the accomsey,have invented certain new and usefulImpanying drawings, in which- 5 5 provements in Attachments for Drawing-Figure 1 is a plan view of my drawing-board Boards; and I do herebydeclare the following attachment, clearly illustrating the novel featobe a full, clear,and exact description of the tures and the principlesof my invention, and invention, such as will enable others skilled Fig.2 is a vertical cross-section of the same.

in the art to which it appertains to make and Fig. 3 is a detailsection, on an enlarged scale,

use the same, reference being had to the acof a portion of the device,illustrating more companying drawings, and to letters of referclearlythe operative relation of the circular ence marked thereon,which formapart of this board, sliding ring or frame, and linead, andspecification. a means for securing the device upon a bot- 15 Thisinvention is in the nature of an im-, tom board or table, if. desired.Fig. 4 is a provement in draftsmens boards, and has for perspective Viewof a rule or linead used in one of its objects to provide a device orinconnection with' the device. Figs. 5 and 6 strument which is to beused in connection are detail sectional views of parts of the cirwithdrawing-boards, by means of which cular board-and sliding ring or frame,illus- 20 parallel and angularly-arranged lines can be trating in planand side View, respectively, a drawn with the use of asliding rule orlinead, modified form of means for holding or locking and which may alsobe made to rotate in the said sliding ring or frame in its adjustedposimanner to be hereinafter fully specified to tion. Fig. 7 is aplanview of a drawing-board take the place of the ordinary T-square, andattachment of a slightly different construc- 2 5 avoiding the use of atriangle in connection tion,but still embodying the features of myinwith the rule or square, as heretofore. vention. Fig. Sis a plan viewof a drawing- To avoid the annoyance caused by the 118C? boardattachment of still another modified essary handling of two instruments,or deform of construction. Fig. 9 is a vertical vices, namely, theT-square and triangle, and section of the same, taken on line or inFig.8;

30 to provide an instrument for doing the same and Fig. 10 is a detailsection of a springwork in making mechanical drawings and actuatedlocking device forholdingthe sliding architectural and other drawings inless time ring or frame in its adjusted position. and less labor thanheretofore is therefore Similar letters of reference are employed to theprincipal object of my invention. indicate corresponding parts in all ofthe said 5 To this end the invention consists, broadly, views. 8 5 inthe arrangement and combination of a cir- In said drawings, 1)represents an ordinary cular board, on which the drawing-paper orbase-board or table on which is placed my other material is to besecured in the usual novel form of drawing board attachment. manner, amovable or rotatable ring or frame The latter consists of a circulardrawing- 40 connected with said board, and a sliding rule board a, ofany suitable size, and upon which 0 or linead connected with said ringor frame. is arranged or secured, in the usual manner,

The invention consists, further, in the ara sheet of drawing-paper orother material, rangement and combination,withthis circular as clearlyillustrated in Fig. 1. Said drawboard provided with graduations at ornear ing-board amay be simply placed upon the 45 its outer periphery,representing degrees, of board or table I) withoutbeing fastened down, asliding ring or frame to be used in connecbut, if desired, suitablefa'steningdugs 0 may tion with said board, and a sliding rule or beused, each lug having a perforation c:and linead connected with saidring or frame. being secured by means of screws or pins 0 The inventionconsists, still further, in certo the base-board I). The opposite end of50 rain other arrangements and combinations of each h1g0 is arranged ina recessed part a in the bottom of the circular board a, and is fastenedtherein by means of a screw 0 as clearly represented in Figs. 2 and 3.Of course it will be evident that other suitable means may be employedfor securing the board a in position on the base-board or table Asclearly shown in the several figures of the drawings, I may secure tothe outer peripheral edge of said circular plate or drawing-board a ametallic or other suitable band a", provided with graduationsrepresenting numbers of degrees. Encircling said drawing-board a, is asuitable ring or frame (I, which is preferably made of metal, but may bemade of wood, if desired, and has one or more squared sides or straightedges cl, on each of which is arranged a comparatively wide bar 01 and anarrower bar (1 secured together in any well-known manner, butpreferably by means of a thumb-screw 61 substantially as illustrated inFig. 3. Said bars d and d on opposite sides of said ring or frame 01form suitable ways or guides for a sliding rule or linead e, which ismade of wood in the manner of an ordinary T-square. At each end of saidlinead or rule 6 I have secured the cross-heads e, which are preferablycut away, as at c and fit and are capable of sliding on the portions 01of the bars (1*. If desired, one or both of said bars 01 may be providedwith a scale, as illustrated in Fig. 1. As shown more particularly inFig. 3, the holes d, in which the bolts or thumb-screws d are arranged,are oblong to permit the adjustment of said bars (1 either way when thelinead e binds on the guides or when said guides are not parallel. Saidring or frame cl is rotatively arranged on the upper surface of the saidlugs c and may be held or locked in any adjusted position by means ofone or more cams f, pivotally arranged on the base-board b in the manneras will be clearly evident from an inspection of Fig. 1.

In lieu of the construction of the several parts illustrated in Figs. 1,2, and 3 the lugs 0 may be dispensed with and a metallic or othersuitable ring a secured to the board b. The -ring or frame d, whichencircles the drawing-board a, is provided with an annular flange d andis held in place by means of washers g on suitable screw-bolts g in saidbase-board b, said washers being tightened down against said flange d orunloosened by thumb-nuts g substantially as illustrated in Figs. 5 and6. Thus it will be seen that when the nuts 9 are untightened then thering or frame at can be rotated or moved to any desired position, andwhen the nuts are again tightened down then said ring or frame is heldin its adjusted position.

- The operation of the device is as follows: To use the linead e fordrawing horizontal lines on the paper on the drawing-board a, thezero-mark at d on the ring or frame d is made to correspond with thezero-mark on the board a. The rule or linead can then be made to slideup and down on the guides or ways connected wit-h said ring or frame d,and any number of horizontal and parallel lines can be drawn. To drawVertical lines without the use of the triangle, the cam-levers f orother suitable locking means employed are disengaged from their holdingcontact with the ring or frame at and the latter is rotated or moved tobring its zero-mark at d directly opposite the number 9O on thedrawing-board a. The guides or ways and the rule or linead being fixedon said ring or frame (1 will of course move with the same, andtherefore any number of vertical lines can be drawn with the rule orlinead e. By bringing the zeropoint at d opposite any other number onthe drawing-board a, parallel lines can be drawn at any desired angle,as will be clearly evident from an inspection of Fig. 1.

In Fig. 7 I have shown a construction of drawing-board attachment inwhich the ring or frame d is provided with but one bar d on one side ofthe same, said bar being perfectly flat on its upper surface. This bar,as indicated in said figure, can be used as a straight-edge for placingan ordinary T- square against the same, and when it is desired to drawlines at any angle all that is necessary is to change the position ofthe ring or frame (1, thereby bringing the bar d to another position,and the T-square can be used in the usual manner.

In Figs. 8, 9, and 10 I have shown still another modified form ofconstruction of the device, which consists in the arrangement of thecircular drawing-board a, secured by means of the screws b to the lowerboard or .open framework I). Said drawing-board a is surrounded by thegraduated rim or ring a hereinabove mentioned. Encircling said board aand its ring a is the sliding part d, which in this case is made in themanner of a square and open frame, and on two sides of which are securedthe bars d forming the guides or ways for the rule or linead e. One ofsaid bars (i may be provided with graduations, as clearly shown. Theoperations of the several parts of this device are similar to thosedescribed in connection with the construction shown in Figs. 1 and 2,except that I employ a different locking means for holding or lookingthe frame (1 in its adjusted position. In one side of the frame (I is aperforation (2 into which extends a pin h, having a finger-piece h and agroove 77?, as clearly shown in Fig. 10. Secured to the side of saidframe (Z is a spring 11, having the forked end 1', which extends intosaid groove h and normally forces the end h of the pin h into frictionalholding contact with the circular edge of the board a or the metallicband a, surrounding the same, as will be clearly evident.

The utility of the herein-described device will be evident from theabove description and an inspection of the drawings, doing away with theuse of the triangle.

It is also 1 of great benefit to the draftsman in sectionizing drawingsand quickly laying out poly onal figures.

I am fully aware that many changes may be made in the details of thearrangements and constructions of the parts. Hence I do not limit myselfto the exact combinations of the parts herein shown and described.

Having thus described my invention, what I claim is- 1. An attachment ordevice for drawing, comprising therein, a circular drawing-board, amovable or rotatable ring or frame encircling said board, and a slidingrule or linead, all operating substantially as and for the purposes setforth.

2. An attachment or device for drawing, comprising therein, a circulardrawing-board, a band encircling said board and having graduations, amovable and rotatable ring or frame encircling said board, and a slidingrule or linead, all operating substantially as and for the purposes setforth.

3. An attachment or device for drawing, comprising therein, a circulardrawing-board, a movable or rotatable ring or frame encircling saidboard, and a straight edge on said ring or frame, on which a linead maybe used, substantially as and for the purposes set forth.

4. An attachment or device for drawing, comprising therein, a circulardrawing-board, a band encircling said board and having graduations, amovable and rotatable ring or frame encircling said board, and astraight edge on said ring or frame, on which a linead may be used,substantially as and for the purposes set forth.

5. -An attachment or device for drawing, comprising therein, a circulardrawing-board, a movable or rotatable ring or frame encircling saidboard, guides or ways on said ring or frame, and a rule or lineadmovable on said guides or ways, substantially as and for the purposesset forth.

6. An attachment or device for drawing, comprising therein, a circulardrawing-board, a band encircling said board and having graduations, amovable or rotatable ring or frame encircling said board, guides or wayson said ring or frame, and a rule or linead movable on said guides orways, substantially as and for the purposes set forth.

7. An attachment or device for drawing, comprising therein,a circulardrawing-boar d, a movable or rotatable ring or frame encircling saidboard, guides or ways on said ring or frame, and a rule or lineadmovable on said guides or ways, and means adapted to engage with saidring or frame to hold or look the same in its moved or rotated position,substantially as and for the purposes set forth.

8. An attachment or device for drawing, comprising therein, a circulardrawing-board, a band encircling said board and having graduations, amovable or rotatable ring or frame encircling said board, guides or wayson said ring or frame and a rule or linead movable on said guides orways, and means adapted to engage with said ring or frame to hold orlook the same in its moved or rotated position,substantially as and forthe purposes set forth.

9. An attachment or device for drawing, comprising therein ,a circulardrawing-board, lugs a secured to said board, a ring or frame encirclingsaid board and movably or rotatively arranged on said lugs, guides orways on said ring, and a rule or linead movable on said guides or ways,substantially as and for the purposes set forth.

10. An attachment or devicefor drawing, comprising therein, a circulardrawing-board, a band encircling said board and having graduations, lugsc secured to said board, a ring or frame encircling said board andmovably or rotatively arranged on said lugs, guides or ways on said ringor frame, and a rule or linead movable on said guides or ways,substantially as and for the purposes set forth.

11. An attachment or device for drawing, comprising therein a circulardrawing-board, lugs c secured to said board, a ring or frame encirclingsaid board and movably or rotatively arranged on said lugs, guides orways on said ring, and arule or linead movable on said guides or ways,and means adapted to engage with said ring or frame to hold or look thesame in its moved or rotated position, substantially as and for thepurposes set forth.

12. An attachment or device for drawing, comprising therein, a circulardrawing-board, a band encircling said board and having graduations, lugsc secured to said board, a ring or frame encircling said board andmovably or rotatively arranged on said lugs, guides or ways on said ringor frame, a rule or linead movable on said guides or ways, and meansadapted to engage with said ring or frame to hold or lock the same inits moved or rotated position, substantially as and for the purposes setforth,

In testimony that I claim the invention set forth above I have hereuntoset my hand this 28th day of October, 1895.

JACOB O. POOLE.

Witnesses:

FREDK. O. FRAENTZEL, E. P. BACKUS.

